A comparison of three methods for the in situ determination of acoustic absorption coefficients
Keywords:Impulse response, Absorption coefficients, Acoustic absorption coefficients, In-situ, Reflected sounds, Resonant surfaces, Rigid surfaces, Thin sheet
AbstractA study was conducted to compare three methods that were used to determine the absorption coefficient of a surface in situ. The first two methods included a reflection method and a subtraction technique to separate the incident and reflected sound waves of the impulse response. The third method utilized the first two measurements at a surface being investigated and at a rigid surface at the same location to calculate the absorption coefficient. A rigid surface was approximated by mounting a thin sheet against the surface being investigated. Two measurements were taken, including a measurement directly on the investigated surface and the second with an intervening reflective sheet. Three different surfaces were measured, including a resonant surface, an absorptive surface, and a rigid surface.
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